<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		.bg{
			height: 400px;
			background-color: red;

		}
	</style>

</head>
<body>
	<div class="bg" name='ttt'>
		<video src="http://ossweb-img.qq.com/images/lol/v1/banner/big-v10.webm" width="1000" autoplay loop>
		</video>
			<div><!-- 123 --></div>


	</div>
</body>
		<script type="text/javascript">
		window.onload = function(){
			var div = document.getElementsByName('ttt')[0];
			console.log(div);
			
		}
		document.write('123');

		var  a = '123.44a';
		var b;
		// var a = 13;
		console.log(5/2);

	</script>
</html>